Discussion PSU for InWin Chopin


What's an ITX?
Original poster
New User
Mar 1, 2021
Hi everyone.
I just stumbled upon this forum. I finished my first ITX build a month ago.
It goes like this:
Case: InWin Chopin
PSU: came with case
MB: ASRock A520M-ITX/ac
CPU: Ryzen 4650G with stock cooler (Wraith Stealth without the plastic guard so it can fit)
RAM: 16 GB G.Skill Flare X (F4-3200C14D-16GFX) in dual channel on 3200 MHz
SSD: Samsung 970 EVO m.2 250 GB
Storage: Crucial MX500 1TB

So, first of all, the PSU fan is a disaster when under any load... I changed the stock PSU fan for the Noctua NF-A4x10 FLX which I than connected to the fan header on my motherboard, tuned the BIOS setting for that fan to "standard" mode, and voila.

Now I did some short testing (about an hour or so) with Aida64's system stability test, and it's working fine, just that the CPU temps are a little bit uncofortable for me: it idles around 35-45°C and when doing the test it was around 88-90°C, and it even got to 93 at an instant.

Since there is not much I can do for better airflow in such a small case, I was thinking about two things:
1) lower the voltage on the CPU
2) replace the stock PSU with a PicoPSU or a HDPLEX 200 to make room for 2 small noctua fans on the bottom of the case
3) I'll consider changing the CPU cooler for a Noctua NH-L9a-AM4 or a Cooler Master MasterAir G200P (since it's rated for 95W TDP VS Noctua's 65W)

So, first about undervolting/underclocking the CPU. Since I never did that on a Ryzen APU, I don't know exactly where to start. I also read HERE that it's possible to "enable the 35 watt mode" on newer Ryzen APU's. If anyone has any info that could help me regarding undervolting/underclocking and/or that 35W mode, it would be awesome :)

Second, about these tiny PSU's. I'd prefer to have the brick outside the case because of extra space inside the case, plus the temperature. And here is my next question: how are the PicoPSU-160-XT and HDPLEX 200W DC-ATX coping with temperature? I mean, afaik, the PicoPSU input is 12V, and the HDPLEX is 19V. Therefore, the PicoPSU should be colder than the HDPLEX, becase the latter must convert from 19 to 12V, so there must be SOME heat (it even has the heatsink). I tried searching for info about that, but with no luck.

I would appreciate any help :)


Cable-Tie Ninja
Oct 19, 2018
from what I have heard, the HD Plex Psu's are very efficient, generate not much heat, and dead silent.


Case Bender
New User
Feb 15, 2021
I have attached heat conduction pad between inner case and outer C shaped aluminum external panel. They are connected by bolts but there are spaces between them so heat is not dissipated. Attaching thermal pad at top part and bottom part (front part is covered by plastic front panel so meaningless) does not make case cool because case is hot and cooling fan is usually weak, but make them easily cooled and slowly warmed. Without thermal pad inner case hot but exterios aluminum cool, but with thermal pad exterior part also become warm so proving heat is dissipated through them.
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Cable Smoosher
Jan 29, 2021
I've built a chopin and a BQ656 (similar to chopin) and I'm surprised you are complaining about the psu fan when the cpu cooler fan would be way louder (both running NH-L9s, one with 3400G, other with 4750G). The 4750G thermal throttles at max loads and I've been thinking of making a duct for the fan right up to the mesh so intake or exhaust (flip the fan around) would be much cleaner as I suspect there is a lot of recirculation inside the case as I don't feel much hot air coming out of any of the vents. Also wondering if I could squeeze in a 120 or 140mm fan instead of the 92mm on the NH-L9 to increase the intake, which would help tremendously.


Average Stuffer
Jul 23, 2020
After seeing a few really nice looking Chopin builds recently and having to stay and work inside a hotel for once a month since January, got me thinking on a building a Chopin with a 4650g myself (still hesitating). Would not need anything more than an AsRock B520-; or 550-ITX/ac and it would look gorgeous with my L9a chromax cooler and I could just hook it to the TV in the room with an HDMI cable and play away.

Btw, while I can only recommend you to try switching that stock amd cooler to the L9a as step 1 before making any other move like ditching your already noctuarized psu or switching to 35w mode. I was a bit skeptic about the L9a but after trying it I was seriously impressed. I'm cooling a 3300x set to 4.2Ghz with 1.225v with it in my Dan A4 (and a fan duct) using Carbonaut - so not even proper thermal paste, and it works great. This cpu is considered a bit warmer than a R5 3600 and this cooler is able to tame it nicely.
It is cheap, available, zero compatibility issues regarding motherboard, RAM or M.2 heatsinks, better backplate than what comes with any mobo, only 37mm tall and it is a lot more silent than most other (especially the AMD stock) cooler.
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